US6450691B1 - Rolling bearing with sealing plate having grease enclosed therein - Google Patents

Rolling bearing with sealing plate having grease enclosed therein Download PDF

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Publication number
US6450691B1
US6450691B1 US09/645,549 US64554900A US6450691B1 US 6450691 B1 US6450691 B1 US 6450691B1 US 64554900 A US64554900 A US 64554900A US 6450691 B1 US6450691 B1 US 6450691B1
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United States
Prior art keywords
rolling bearing
tetrafluoroethylene
grease
mol
propylene
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US09/645,549
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English (en)
Inventor
Kenji Okuma
Koichi Goto
Takahiko Uchiyama
Shigeharu Saigusa
Katsuyuki Nakai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyo Seal Industries Co Ltd
NSK Ltd
Original Assignee
Toyo Seal Industries Co Ltd
NSK Ltd
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Publication date
Application filed by Toyo Seal Industries Co Ltd, NSK Ltd filed Critical Toyo Seal Industries Co Ltd
Assigned to TOYO SEAL INDUSTRIES CO., LTD., NSK LTD. reassignment TOYO SEAL INDUSTRIES CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GOTO, KOICHI, NAKAI, KATSUYUKI, OKUMA, KENJI, SAIGUSA, SHIGEHARU, UCHIYAMA, TAKAHIKO
Application granted granted Critical
Publication of US6450691B1 publication Critical patent/US6450691B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
    • F16C33/7843—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6633—Grease properties or compositions, e.g. rheological properties

Definitions

  • the present invention relates to a rolling bearing with a sealing plate having a grease enclosed therein, which is used to form the rotary supporting portion of automobile auxiliary machineries to be installed in engine room such as alternator and compressor.
  • the present invention is intended to improve the reliability and durability of a rolling bearing with a sealing plate having a grease enclosed therein which is used at high temperatures (e.g., 170° C. or higher).
  • rolling bearings with a sealing plate 1 and 1 a as shown in FIGS. 1 and 2, respectively are used.
  • the rolling bearings with a sealing plate 1 and 1 a each composed of an outer race 3 having an outer raceway 2 formed in the middle portion of the inner surface thereof, an inner race 5 having an inner raceway 4 formed in the middle portion of the outer surface thereof, and a plurality of rolling elements rotatably provided between the outer raceway 2 and the inner raceway 4 .
  • a sealing plate 7 a or 7 b Provided extending between the both ends of the inner surface of the outer race 3 and the both ends of the inner race 5 is a sealing plate 7 a or 7 b.
  • the sealing plate 7 a or 7 b blocks the both axial opening ends of a space 8 defined by the inner surface of the outer race 3 and the outer surface of the inner race 5 having the rolling elements 6 provided therein.
  • a grease is enclosed in the space 8 between the pair of sealing plates 7 a or 7 b to lubricate the area at which the outer raceway 2 and the inner raceway 4 come in rolling contact with the rolling surface of the rolling elements 6 .
  • the sealing plates 7 a and 7 b each comprise a circular core metal 9 formed by a metal plate such as steel plate, and an elastic material 10 a or 10 b provided covering the core metal 9 and reinforced by the core metal 9 .
  • the inner and outer edges of the elastic materials 10 a and 10 b radially protrude beyond the inner and outer edges of the core metal 9 .
  • the sealing plates 7 a and 7 b engage the elastic materials 10 a and 10 b, respectively, with a stop groove 11 formed on the both ends of the inner surface of the outer race 3 so that they are supported at the both axial ends of the space 8 .
  • the sealing plate 7 a shown in FIG. 1 is a contact type seal while the sealing plate 7 b is a non-contact type seal.
  • a grease selected from the group consisting of the foregoing materials ( 1 ) and ( 2 ) and a sealing plate 7 a or 7 b comprising the elastic material 10 a or 10 b, respectively, made of a rubber selected from the foregoing materials ( 3 ) to ( 5 ) have been properly combined to form a rolling bearing 1 or 1 a with a sealing plate having a grease enclosed therein.
  • the combination of the fluorine-based grease ( 2 ) and the fluororubber ( 4 ) or ( 5 ) exhibits a sufficient heat resistance but exhibits an insufficient grease durability under high rate and high load working conditions. Accordingly, this combination is not suitable for the construction of the rotary supporting portion of alternator, compressor, etc.
  • the combination of the fluorine-based grease ( 2 ) and the acrylic rubber ( 3 ) not only exhibits an insufficient grease durability under high rate and high load working conditions but also exhibits a deteriorated elasticity of acrylic rubber after prolonged use at high temperatures, causing the sealing plate 7 a or 7 b to show a deterioration of sealing properties. Accordingly, this combination, too, is not suitable for the construction of the rotary supporting portion of alternator, compressor, etc.
  • the combination of the urea-based grease ( 1 ) and the acrylic rubber ( 3 ) exhibits a deteriorated elasticity (hardening) of acrylic rubber after prolonged use at high temperatures, causing the sealing plate 7 a or 7 b to show a deterioration of sealing properties. Accordingly, this combination, too, is not suitable for the construction of the rotary supporting portion of alternator, compressor, etc.
  • the combination of the urea-based grease ( 1 ) and the fluororubber ( 4 ) or ( 5 ) exhibits a deteriorated elasticity of fluororubber due to the effect of urea compound at high temperatures, causing the sealing plate 7 a or 7 b to show a deterioration of sealing properties. Accordingly, this combination, too, is not suitable for the construction of the rotary supporting portion of alternator, compressor, etc.
  • a urea-based grease if used as a grease, exhibits an insufficient durability under high rate and high load working conditions in any case.
  • the resulting rolling bearing with a sealing plate having a grease enclosed therein cannot be secured with a sufficient durability.
  • the results of experiment made by the inventors in this respect will be described in connection with FIG. 3 .
  • the experiment was made with a deep groove ball bearing having an inner diameter of 17 mm, an outer diameter of 52 mm and a width of 17 mm.
  • this ball bearing was operated at a rotary speed of 18,000 r.p.m. at an ambient temperature of 180° C. and a radial load of 150 kgf. Under these conditions, the time required until seizing due to mallubrication occurs was measured.
  • the grease to be enclosed in a rolling bearing with a sealing plate which constitutes the rotary supporting portion of automobile auxiliaries to be installed in engine room such as alternator and compressor is preferably urea-based.
  • a urea-based grease and the conventional fluororubber ( 4 ) or ( 5 ) is liable to hardening of fluororubber at high temperatures that makes it difficult to secure sufficient sealing properties as previously mentioned.
  • the results of experiment made by the inventors in this respect are shown in Table 1.
  • the grease to be enclosed in the rolling bearing with a sealing plate constituting the rotary supporting portion of automobile auxiliaries to be installed in engine room such as alternator and compressor is preferably urea-based and the elastic materials 10 a and 10 b for sealing plate 7 a and 7 b, respectively, having a good affinity for urea-based grease is an acrylic rubber.
  • the acrylic rubber showed a drop of elasticity after prolonged use at high temperatures, making it difficult for the sealing plate 7 a or 7 b to provide sufficient sealing properties over an extended period of time as previously mentioned. Accordingly, the acrylic rubber, too, cannot be preferably used as the elastic material 10 a or 10 b for rolling bearing with a sealing plate.
  • FIG. 1 is a partly enlarged sectional view illustrating a first embodiment of the rolling bearing with a sealing plate to which the present invention applies;
  • FIG. 2 is a partly enlarged sectional view illustrating a second embodiment of the rolling bearing with a sealing plate to which the present invention applies;
  • FIG. 3 is a graph illustrating the results of an experiment made to know the effect of the kind of grease on the durability of the rolling bearing
  • FIG. 4 is a graph illustrating the results of an experiment made to know the effect of the material of the elastic material constituting the sealing plate and the material of the grease on the change of the hardness of the elastic material;
  • FIG. 5 is a graph illustrating the results of an experiment made to know the effect of the material of the elastic material constituting the sealing plate and the material of the grease on the durability of the rolling bearing.
  • a rolling bearing with a sealing plate having a grease enclosed therein includes an outer race having an outer raceway formed on the inner surface thereof; an inner race having an inner raceway formed on the outer surface thereof; a plurality of rolling elements rotatably provided between the outer raceway and the inner raceway; a pair of sealing plates each having an elastic material, which is provided for covering between the both ends of the inner surface of the outer race and the both ends of the outer surface of the inner race, for blocking the both axial opening ends of the space defined by the inner surface of the outer race and the outer surface of the inner race having the rolling elements provided therein; and a grease enclosed in the space between the sealing plates.
  • the grease is a urea-based grease and the elastic material is a vulcanizable fluororubber composition composed of at least one of a vinylidene fluoride-tetrafluoroethylene-propylene terpolymer and a tetrafluoroethylene-propylene bipolymer.
  • vinylidene fluoride-tetrafluoroethylene-propylene terpolymer there is preferably used one having a vinylidene fluoride copolymerization ratio of from about 1 to 70 mol % (preferably from 2 to 65 mol %), a tetrafluoroethylene copolymerization ratio of from about 1 to 70 mol % (preferably from 20 to 60 mol %) and a propylene copolymerization ratio of from about 1 to 70 mol % (preferably from 10 to 45 mol %).
  • a vinylidene fluoride-tetrafluoroethylene-propylene terpolymer there may be used a commercially available product such as “BRE LJ-298005” (produced by SUMITOMO 3M LIMITED).
  • tetrafluoroethylene-propylene bipolymer there is preferably used one having a tetrafluoroethylene copolymerization ratio of from about 20 to 80 mol % (preferably from 40 to 60 mol %) and a propylene copolymerization ratio of from about 20 to 80 mol % (preferably from 40 to 60 mol %).
  • a tetrafluoroethylene-propylene bipolymer there may be used a commercially available product such as “AFLAS 150” (produced by Asahi Glass Co., Ltd.).
  • any fluorororubber of the foregoing terpolymer, bipolymer or proper composite thereof are blended with various compounding agents required from the standpoint of vulcanizability, physical properties and workability.
  • the mixture is then kneaded by any known method using an open roll mill, kneader or the like to adjust the composition thereof.
  • the composition thus adjusted is then subjected to vulcanization by any known vulcanization process such as heat press to obtain an elastic material 10 a or 10 b as shown in FIG. 1 or 2 .
  • the core metal 9 for forming the sealing plate 7 a or 7 b with the elastic material 10 a or 10 b, respectively is previously set in the molding cavity.
  • the rolling bearing with a sealing plate having a grease enclosed therein includes a urea compound enclosed therein as a grease and thus can be secured with a sufficient grease durability even under high temperature, high rate and high load working conditions.
  • the fluororubber which is a vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, tetrafluoroethylene-propylene bipolymer or complex thereof, has a sufficient heat resistance and doesn't become hard too much even when brought into contact with the urea compound at high temperatures.
  • the sealing plate can assure sufficient sealing properties even after prolonged use at high temperatures.
  • Example 2 Material Nipol AR-71 100 *1 FC-2176 *2 100 BRE LJ- 100 298005 *3 AFLAS 150 *4 100 ASAHI 60H *5 60 celite #219 *6 25 25 25 25 Sodium 3 stearate Potassium 0.5 stearate Sulfur 0.3 Kyowamag 3 3 150 *7 Calbit *8 6 6 3 TAIC *9 5 Barhexa 25B- 1 40 *10 Vulcanizing conditions Primary 170° C. ⁇ 170° C. ⁇ 170° C. ⁇ 170° C. ⁇ vulcanization 20 min. 10 min. 10 min. 10 min. Secondary 150° C. ⁇ 210° C. ⁇ 210° C.
  • *1 indicates the trade name of an acrylic rubber produced by Nippon Zeon Co., Ltd.
  • *2 indicates the trade name of a fluororubber as vinylidene fluoride-hexafluoropropylene bipolymer produced by SUMITOMO 3M LIMITED
  • *3 indicates the trade name of a fluororubber as vinylidene fluoride-tetrafluoroethylene-propylene terpolymer produced by SUMITOMO 3M LIMITED
  • *4 indicates the trade name of a fluororubber as tetrafluoroethylene-propylene bipolymer produced by Asahi Glass Co., Ltd.
  • *5 indicates the trade name of an MAF carbon produced by Asahi Carbon Co., Ltd.
  • *6 indicates the trade name of diatomaceous earth produced by Manville Inc.
  • *7 indicates the trade name of magnesium oxide produced by Kyowa Chemical Industry Co., Ltd.
  • *8 indicates the trade name of calcium hydroxide produced by Ohmi Chemical Industry
  • the elastic material forming the sealing plate is formed by a fluororubber which is a tetrafluoroethylene-propylene bipolymer or vinylidene fluoride-tetrafluoroethylene-propylene terpolymer
  • the change of physical properties and volume can be minimized even when the elastic material is brought into contact with the urea-based grease at high temperatures.
  • This demonstrates that such an elastic material can exhibit good sealing properties over an extended period of time even when a urea-based grease is used.
  • the inventors made a second experiment to know how the hardness of the elastic material constituting the sealing plate changes with the affinity of the elastic material for the grease and the ambient temperature.
  • the second experiment was carried out by allowing a deep groove ball bearing with a contact type sealing plate of Call No. 6202 having an inner diameter of 15 mm, an outer diameter of 35 mm and a width of 11 mm to stand in a high temperature atmosphere.
  • the ambient temperature was 180° C.
  • the period of time during which the ball bearing is allowed to stand was 500 hours.
  • the hardness of the elastic material constituting the sealing plate incorporated in the sample was then measured by the method for measuring international rubber hardness defined in JIS K 6253 (IRHD).
  • the results of the second experiment were shown in FIG. 4 .
  • the solid line a indicates the results of experiment on the combination of a conventional sealing plate provided with an fluororubber rubber elastic material and a urea-based grease
  • the broken line b indicates the results of experiment on the combination of a sealing plate provided with an acrylic rubber elastic material and a urea-based grease
  • the dot-and-chain line c indicates the results of experiment on the combination of a sealing plate provided with a fluororubber elastic material and a urea-based grease according to the invention
  • the two dots-chain line d indicates the results of experiment on the combination of a conventional sealing plate provided with a fluororubber elastic material and a fluorine-based grease.
  • the present invention makes it possible to minimize the change in the hardness of the elastic material as in the case where a fluorine-based grease is used as a grease.
  • the combination with a fluorine-based grease cannot provide a sufficient durability under high speed and high load operating conditions as previously mentioned.
  • the enhancement of the hardness of the acrylic rubber elastic material as shown in FIG. 4 is attributed to the heat resistance problem with the acrylic rubber itself rather than the problem of affinity for urea-based grease.
  • the inventors further made an experiment on the durability of grease during high speed operation.
  • the results of this experiment will be described in connection with FIG. 5 .
  • the experiment was made on a deep groove ball bearing having an inner diameter of 17 mm, an outer race of 52 mm and a width of 17 mm.
  • the inner race of the ball bearing was rotated at 18,000 r.p.m. in a 180° C. atmosphere. The time required until seizing due to mallubrication occurs was measured.
  • the rolling bearing with a sealing plate having a grease enclosed therein has the foregoing constitution and action and thus can contribute to the improvement of reliability and durability of the rotary supporting portion of various apparatus to be used in a high temperature atmosphere under a high load and high speed conditions such as automobile auxiliaries.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Sealing Material Composition (AREA)
  • Sealing Of Bearings (AREA)
US09/645,549 1999-08-25 2000-08-25 Rolling bearing with sealing plate having grease enclosed therein Expired - Lifetime US6450691B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP23818399A JP2001065578A (ja) 1999-08-25 1999-08-25 グリースを封入した密封板付転がり軸受
JP11-238183 1999-08-25

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050100259A1 (en) * 2003-11-07 2005-05-12 Ntn Corporation Sealing member for use in rolling bearing and rolling bearing
US20050152628A1 (en) * 2004-01-14 2005-07-14 Masaki Egami Rolling bearing for use in vehicle
WO2005098257A3 (en) * 2004-04-01 2005-12-15 Gen Motors Corp Viscous fluid clutch assembly
US20060104559A1 (en) * 2004-11-17 2006-05-18 Wingett Paul T Side shields for fractured outer ring bearing
US20070199784A1 (en) * 2004-04-01 2007-08-30 General Motors Corporation Clutch Assembly
US20070206892A1 (en) * 2004-08-19 2007-09-06 Nsk, Ltd. Rolling Bearing
US20070242912A1 (en) * 2006-04-13 2007-10-18 Hideaki Tanaka Rolling bearing
US20070253655A1 (en) * 2004-12-28 2007-11-01 Ntn Corporation Rolling bearing
EP1555448A3 (en) * 2004-01-14 2010-09-01 NTN Corporation Rolling bearing for use in vehicle
US20110255812A1 (en) * 2010-04-15 2011-10-20 Connell Richard J Bearing Assembly for a Disk Gang
US20140133792A1 (en) * 2011-06-27 2014-05-15 Ntn Corporation Rolling bearing

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004092738A (ja) * 2002-08-30 2004-03-25 Nsk Ltd 転がり軸受及びモータ
DE20306004U1 (de) 2003-04-15 2003-07-03 AB SKF, Göteborg/Gotenburg Lageranordnung
US8188016B2 (en) 2003-07-08 2012-05-29 Ntn Corporation Lubricant composition and bearing using same
JP2005256891A (ja) * 2004-03-10 2005-09-22 Ntn Corp ファンカップリング用転がり軸受およびファンカップリング装置
JP2005249090A (ja) * 2004-03-04 2005-09-15 Ntn Corp フライホイールダンパ用転がり軸受およびフライホイールダンパ支持構造
JP2006029347A (ja) * 2004-07-12 2006-02-02 Ntn Corp 自動車電装補機用転がり軸受
JP2006029346A (ja) * 2004-07-12 2006-02-02 Ntn Corp 転がり軸受
DE112006000987T5 (de) 2005-04-20 2008-03-06 Ntn Corp. Schmierfettzusammensetzung, Lager mit eingeschlossenem Schmierfett und Rotationsübertragungsvorrichtung mit eingebauter Einwegkupplung
JP2007040446A (ja) * 2005-08-04 2007-02-15 Ntn Corp 自動車電装・補機用転がり軸受
DE102007016729A1 (de) * 2007-04-07 2008-10-09 Zf Lenksysteme Gmbh Radialflexibles Wälzlager
JP2008267543A (ja) * 2007-04-24 2008-11-06 Nsk Ltd 転がり軸受

Citations (4)

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Publication number Priority date Publication date Assignee Title
US4758618A (en) * 1985-10-11 1988-07-19 Asahi Glass Company, Ltd. Curable composition of elastomeric vinylidene fluoride copolymer
JPH07157620A (ja) * 1993-12-03 1995-06-20 Nok Corp フッ素ゴム組成物
JPH09143327A (ja) * 1995-11-22 1997-06-03 Nok Corp ブレンドゴム組成物
US5859144A (en) * 1995-09-29 1999-01-12 Nippon Mektron, Limited Process for producing rubber compound

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4758618A (en) * 1985-10-11 1988-07-19 Asahi Glass Company, Ltd. Curable composition of elastomeric vinylidene fluoride copolymer
JPH07157620A (ja) * 1993-12-03 1995-06-20 Nok Corp フッ素ゴム組成物
US5859144A (en) * 1995-09-29 1999-01-12 Nippon Mektron, Limited Process for producing rubber compound
JPH09143327A (ja) * 1995-11-22 1997-06-03 Nok Corp ブレンドゴム組成物

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050100259A1 (en) * 2003-11-07 2005-05-12 Ntn Corporation Sealing member for use in rolling bearing and rolling bearing
EP1529975A3 (en) * 2003-11-07 2010-05-12 Ntn Corporation Sealing member for use in rolling bearing and rolling bearing
US20090190873A1 (en) * 2003-11-07 2009-07-30 Masaki Egami Sealing member for use in rolling bearing and rolling bearing
US20050152628A1 (en) * 2004-01-14 2005-07-14 Masaki Egami Rolling bearing for use in vehicle
EP1555448A3 (en) * 2004-01-14 2010-09-01 NTN Corporation Rolling bearing for use in vehicle
US20070278060A1 (en) * 2004-04-01 2007-12-06 Behr America, Inc. Viscous Fluid Clutch Assembly
US20070199784A1 (en) * 2004-04-01 2007-08-30 General Motors Corporation Clutch Assembly
WO2005098257A3 (en) * 2004-04-01 2005-12-15 Gen Motors Corp Viscous fluid clutch assembly
US8893868B2 (en) 2004-04-01 2014-11-25 Mahle Behr Usa Inc. Clutch assembly
US8007181B2 (en) * 2004-08-19 2011-08-30 Nsk Ltd. Rolling bearing
US20070206892A1 (en) * 2004-08-19 2007-09-06 Nsk, Ltd. Rolling Bearing
US20060104559A1 (en) * 2004-11-17 2006-05-18 Wingett Paul T Side shields for fractured outer ring bearing
US20070253655A1 (en) * 2004-12-28 2007-11-01 Ntn Corporation Rolling bearing
US7938583B2 (en) * 2006-04-13 2011-05-10 Ntn Corporation Rolling bearing
US20070242912A1 (en) * 2006-04-13 2007-10-18 Hideaki Tanaka Rolling bearing
US20110255812A1 (en) * 2010-04-15 2011-10-20 Connell Richard J Bearing Assembly for a Disk Gang
CN102235429A (zh) * 2010-04-15 2011-11-09 迪尔公司 用于圆盘组的轴承组件
US20140133792A1 (en) * 2011-06-27 2014-05-15 Ntn Corporation Rolling bearing
US9115762B2 (en) * 2011-06-27 2015-08-25 Ntn Corporation Rolling bearing

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JP2001065578A (ja) 2001-03-16
DE10041874A1 (de) 2001-07-05

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